[Elecraft] [K2] K2 KIO2 Polling Noise in PC Speakers w/ HRD

[N5BCN]

Hi Julian,

I suspect that might be the case.  At first, I thought it was a problem with
the fact the soundcard is right next to the PCI card with the DB9 connector. 
But after connecting the KIO2 cable to a USB/Serial adapter that isn't
anywhere near the soundcard, it suggested something internal to the computer
is being picked up by the soundcard.

I'll try Don's suggestion of connecting the K2 and computer chassis together
and see if that makes a difference.

Brian N5BCN

  

Julian, G4ILO wrote:
> 
> 
> 
> N5BCN wrote:
>> 
>> 
>> I recently completed the KIO2 module (without KPA100) and have been
>> controlling the K2 via HRD v5.0.  I'm passing the K2 audio via the K2 EXT
>> SPKR connection to the PC Mic In and finally out to PC Speakers.
>> 
> 
> It's curious that you're getting this using both a real serial port and a
> USB adapter.  I wonder if you're hearing PC bus noise that is being picked
> up by the computer? Most of us would be blissfully unaware of this since
> we don't listen to our radios through the computer. But it could explain
> why many people claim they get better decoding after switching to an
> external sound card box like a RigExpert or MicroHam.
> 
> Is the noise present when listening to a different audio source (e.g.
> internet radio) while HRD is polling the K2?
> 

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